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Complex spectral filters in silicon waveguides based on cladding-modulated Bragg gratings
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SYSNO ASEP 0543294 Document Type J - Journal Article R&D Document Type Journal Article Subsidiary J Článek ve WOS Title Complex spectral filters in silicon waveguides based on cladding-modulated Bragg gratings Author(s) Pereira-Martin, D. (ES)
Manuel Luque-Gonzalez, J. (ES)
Wangüemert-Pérez, G. (ES)
Hadij-ElHouati, A. (ES)
Molina-Fernández, I. (ES)
Cheben, P. (CA)
Schmid, J.H. (CA)
Wang, S. (CA)
Ye, W. (CA)
Čtyroký, Jiří (URE-Y) RID
Ortega-Moñux, A. (ES)Number of authors 11 Source Title Optics Express. - : Optical Society of America - ISSN 1094-4087
Roč. 29, č. 11 (2021), s. 15867-15881Number of pages 14 s. Publication form Print - P Language eng - English Country US - United States Keywords Bragg gratings ; Photonics ; Waveguide gratings Subject RIV BH - Optics, Masers, Lasers OECD category Optics (including laser optics and quantum optics) R&D Projects GA19-00062S GA ČR - Czech Science Foundation (CSF) Method of publishing Open access Institutional support URE-Y - RVO:67985882 UT WOS 000654369300001 DOI 10.1364/OE.420696 Annotation Spectral filters are important building blocks for many applications in integrated photonics, including datacom and telecom, optical signal processing and astrophotonics. Sidewall-corrugated waveguide grating is typically the preferred option to implement spectral filters in integrated photonic devices. However, in the high-index contrast silicon-on-insulator (SOI) platform, designs with corrugation sizes of only a few tens of nanometers are often required, which hinders their fabrication. In this work, we propose a novel geometry to design complex Bragg filters with an arbitrary spectral response in silicon waveguides with laterally coupled Bragg loading segments. The waveguide core is designed to operate with a delocalized mode field, which helps reduce sensitivity to fabrication errors and increase accuracy on synthesized coupling coefficients and the corresponding spectral shape control. We present an efficient design strategy, based on the layer-peeling and layer-adding algorithms, that allows to readily synthesize an arbitrary target spectrum for our cladding-modulated Bragg gratings. The proposed filter concept and design methodology are validated by designing and experimentally demonstrating a complex spectral filter in an SOI platform, with 20 non-uniformly spaced spectral notches with a 3-dB linewidth as small as 210 pm Workplace Institute of Radio Engineering and Electronics Contact Petr Vacek, vacek@ufe.cz, Tel.: 266 773 413, 266 773 438, 266 773 488 Year of Publishing 2022 Electronic address https://doi.org/10.1364/OE.420696
Number of the records: 1